When and How to Change Your Furnace Filter

December 01, 2015

Taking care of your furnace can help quite a bit in the period in between furnace service appointments. One of the most basic, and critical, ways to maintain your furnace is in switching out your furnace filter. Having a clogged air filter could contribute to a variety of unfavorable problems for your heating and cooling system, its efficiency, and ultimately, how much you’re spending on your energy bills month after month.

So what goes in to deciding when you should change your furnace filter?

  • Type of filter: the two most common filter sizes are 1 inch and 3 inch filters. 1 inch filters usually need to be replaced every month and 3 inch filters ought to be changed every three months, dependent on the recommendations of the filter manufacturer.
  • Home habits: if you have pets in your home, it might make sense to replace your filter more often as a result of pet dander. If a family member deals with allergies or asthma, think about changing your home’s air filter more regularly to help ease their symptoms.

Now you’re likely wondering how to swap out your furnace filter. Inevitably this will change depending on what furnace you have, but normally: 

  • Open or pull off the air filter panel close to the bottom of your furnace to reveal an open compartment.
  • On the top of that open compartment is where your furnace filter is resting on two metal lips.
  • There will be a little space to move your filter back and forth that allows you to remove one end of the filter and pull it out of the compartment.
  • When putting in the new filter, inspect the perimeter of the filter for an arrow that indicates the air flow direction, to ensure you’re installing the filter in the right direction. In the majority of cases, the arrow should point at the main part (or top) of the furnace. 
At Falso Service Experts, we’ll replace standard one-inch furnace filters as part of our regular furnace service Precision Tune-up or PLUS Maintenance Agreement service. Give us a call today at or set up an appointment with us online.